US 1742109 A
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Description (OCR text may contain errors)
D. 31, 1929. J WEBER 1,742,109
ELECTRIC SWITCH MECHANISM Filed Dec. 22, 1927 FC@ e e Inventor` z Louis J. Weber,
H1s,Attor-rnc-25j l Patented Dec. 31, 19.29,
I UNITED STATES' LOUIS J. WEBER, OF
V'PA-llafN'r orifice' scnENEcTADY, New Yoan, Assienon To GENERAL ELECTRIC u', COMPANY, A CORPORATION or NEW from:
ELECTRIC SWITCH MECHANISM 4 -application led December 22, 1927.- Serial No. 241,950.
The present invention relates to electric switches and more particularly to' electro-l magnetically operated multiple pole switches adaptedfor controlling electric motors.
5 .The principal object of the invention is to provide an improved form of electromagneticall operated 4switch mechanism of the i above caracter;
Among the advantageous features of the v improved switch mechanism are the arrange- 20 base in an enclosing casing. Other features will be apparent from the following description of the accompanying drawing which illustrates a preferred form of switch mechanism embodying the invention. l
Fig. 1 is a front View of the preferred form of switch mechanism andthe mounting panel therefor. y 1 n Fig. 2'is a side view of the switch mechanism of Fig. 1, partly insection.
^ shaft carrying the movable switch members and the plunger of the operating electromagnet. u
' Fig. 4; is a perspective view of the switch mechanism mounted in its enclosing casing with the 'cover removed and with certain portions of the switch mechanism omitted,`and
Fig. 5 is an enlarged sectional -view of a portion of the enclosing casing and the mounting panel for the switch mechanism showing more clearly the manner in which the panel is mounted in the casing. v
' rIhe improved switch mechanism as shown in Fig. 1 comprises the base 10 upon which the stationary contact-s 11 andthe operatin electromagnet .12are mounted. The switc shaft 13 carrying a plurality of movable switch contacts 14 which-cooperate with the stationary contact 11 is' rotatably mounted 5 upon thebase 10 between the vstationary con- Fig. 3 is a perspective view of the operating l tact 11 and the operating electromagnet 12. In the preferred construction shown the base 10 is formed of molded insulating material molded thereon for rotatably supporting the switch shaft 13. Likewise, the switch shaft 13 preferably is formed of molded insulating material with the spaced apart bearing surfaces 16 molded therein in proper y spaced relation to be received by the bearing caps 15. The removable bearing caps 17, also preferably formed of molded insulating material, serve to hold the switch shaft 13 secure- ,ly in position in the bearings when secured thereto by the screws 18. In order to maintain the bearing caps 17 in alignment with the open cylindrical bearings 15,'the notches 19 are'prov'ided on one side of the bearing for Y recelving the projecting tongues 2,0 formed on the bearing caps 17.
The square portions of the shaft'13 on either side of the bearing surfaces 16 eifec- Y tively serve to prevent axial displacement of y the shaft in the bearings.' Also the square portions of the shaft 13 provide a mounting surface for theseveral supporting arms whichcarry the' movable switch -contacts 14. The latter are yieldingly mounted on the. arms 25 by means of the springs 26.
VThe molded switch shaft 13 also is provided-with the lever arms 27 which preferably are spaced apart to permit the mountin of the middle contact supporting arm 25 an the U-shaped yoke 28 therebetween. As more clearly shown in Fig. 2, the operating electromagnet 12 is Amounted upon the base 10 at a greater distance therefrom than the switch shaft 13. Furthermore, the operating plunger 29 of the electromagnet is arrange in substantial alignment with the end of the lever arms 27 extending from the switch shaft 13. The U-shaped yoke 28 which is pivotally connected to both the lever arm 27 and the plunger 29, as indicated in the drawing, serves to straddle the magnetic frame 30 of the electromagnet and thereby operatively connect the plunger 29 with the switch shaft 12?. 011e of the principal advantages of construction is lt e fact that the maximum unbalanced weight. pwvided bythe plunger 29 and the .and `has the spaced apart bearing lugs 15 yoke 28 is available for effecting a quick oper# ation of the switch shaft 13 to carry the movable switch members 14 to the circuit openingI 1 position. In addition, by simply unscrewing the screws 18 and removing the bearin caps 1 7 the switch shaft 13,1together wit the movable contacts 14, the plunger 29 of the electromagnet, and the interconnecting mechanism therebetween, may be entirely removed as a unit for inspection and repair.
This is particularly advantageous where' the switch mechanism is mounted in a small enclosing casing as indicated in Fig. 4, as it permits the switch arts to be easily removed.
The switch mec anism as previously described'is particularly adapted for mounting in an enclosing casing in accordance with the requirements for motor control service. The campact arrangement obtained by the operating electromagnet 12 below the switch shaft 13 and on the opposite side of the switch shaft I from thelstationary contacts 11 and between the thermal overload protective devices 21 permits the use of anenclosing casing of minimum size. This is particularly advantageous where the switch mechanism, together with the enclosing casing is to be mounted onv the machine tool and employedto control the operating motor thereof. In such service space requirements are at a premium. The manner in which the base 10 with the switch mechanism mounted thereon is mounted in the enclosing casing 31 is illustrated in Fig. 5. A plurality of spacing bosses 33 areset into the back of the enclosing casing 31 so as to mount the base 10 a slight distance away from the back of the casing.- This provides the space required for the wire connections behind the base 10, and between live parts on back of base'and ground. In order to facili' tate the mounting oit' the base 10 upon the spacing lugs 33, the base is provided with cooperating pockets 34 molded therein for receiving the projecting ends of the lugs 33. .In this way the base is readily mounted upon the supporting lugs 33 with the liolesin the base taining the external wiring connections for the switch. v
The opei'ation of the switch mechanism will be evident from the foregoing description. When the operating electromagnet 12 is deenergized, the plunger 29 is inthe unattracted position as shown in Fig. 4. Hence the switchshat 13 is rotated to earr the movable switch contacts 14 tothe circuit members 14 into en agementV with the stationary contacts 11. ue to the yielding supprtof the movable switch members. 14 provided by the springs 26, a firm enga ement of the individual switches is insure The electrical connections of the switch mechas nism are not shown.l It will lbe understood,
however, that the incoming .three phase linesv are connected to the line terminals L1, L2, L,
`while the three hase motor or other electrical translating evice is connected to the terminals M1, M2, M9. The auxiliary switch 14 is. arranged to be connectedy to establish a holding circuit around the starting push button for the operating electromagnet 12, the holding circuit extending through the contact 23 of the thermal overload protective device, and a stop push button 1n accordance with the usual practice.
What I claim as new and desire to secure by Letters Patent of the United States, is:
1. In an electromagnetically operated switch, the combination of a switch operating shaft having a plurality of switch contacts mounted thereonand having an o erating lever arm extending therefrom, a ase having bearings for rotatably supportingsaid switch shaft in parallel spaced alignment therewith, stationary contacts mounted on said base at one side of said operating shaft in cooperating relation with the contacts on the switch shaft, an operating plunger electromagnet mounted on said base on the other side of said operating shaft with the operating plunger of the electromagnet in substantial alignment with the end of said operating lever arm and with the magnetic vframe of the electromagnet located between the plunger and the arm, and a yoke strad'dling said :tramo and extending between said plungerA and said iever arm.
2. In an electromagnetically operated switch, the combination of a base having a plurality of stationary contacts and an operating plunger electromagnet mounted thereon with the magnetic frame ofthe electromagnet located between the plunger and the contacts, a shaft rotatably mounted on the base between said stationary contacts and the magnetic frame or said electromagnet and having a plurality oi movable switch contacts'V in cooperating relation with said stationary contacts and provided with an 'operating lever arm, and a U-shaped connection between the said lever arm and the operating plunger of the. electromagnet straddling said frame for effecting operation of the movable switch members into and out the mechanical connection between the shaft bearings molded thereon, a switch shaft ofof engagement with .the stationary contacts upon operation-of the plunger.
3. A multiple pole electromagnetically operated switch having a rotatable switch shaft carrying a plurality of movable switch members and mechanically connected with the plunger of an operating electromagnet, and a supporting base provided with bearings for 1rotatably supporting said'switch shaft and having removable bearing caps to permit removal of the shaft, the movable switch members, the plunger of the electromagnet, and
and the plunger as a unit.
4. A multiple pole electromagnetically operated switch having a plurality of movable switch members mounted upon a common Operating shaft With the shaft mechanically connected to the plunger of the operating electromagnet to be operated thereby, and means for removably mountingsaid shaft to permit removal of the shaft, the movable switch contacts, the plunger of the electromagnet and the mechanical connections therebetween as a unit.
5. A multiple pole electromagnetically opi erated switch comprising a base having a plurality of stationary switch contacts mounted thereupon, a switch shaft rotatably mountedy on-said base atone side of said stationary contacts and carrying a plurality of movable switch contacts in cooperating relation with the stationary contacts, an operating electromagnet mounted on the base on the other side of said shaft with the plunger of the electromagnet operable away from the shaft, and means operatively connecting the switch shaft and the plunger including a yoke spanning the electromagnet.
6. In an electromagnetically operated switch the combinationof a base of molded insulating material having spaced apart open molded insulating material with spaced apart bearing surfaces adapted to be rotatably sup ported in said open bearings and having a lever arm extending. from the base, removable bearing caps for closing said bearings, an operating plunger electromagnet mounted on the base with vthe magnetic frame of the electromagnet located between the plunger and said shaft and with the operating plunger pivotally supported upon and in substantial alignment with the end of said lever arm to provide. an -out of balance weight for operating the switch shaft upon deenergization of the electromagnet.
7. In an electromagnetically operated switch, the combination of a rotatably mount-l ed switch member, an operating plunger electromagnet therefor mounted with the frame of the electromagnet between the plunger and the switch membergand means operatively connectingthe plunger and the switch shaft including a yoke shaped connection be-